A rigid container contains saturated vapour at 1.6 bar.  The container is cooled by -440 KJ and the pressure drops to 1 bar.  Calculate the mass of water in the container in kg.  Neglect kinetic and potential energy changes.  Note that the reported heat transfer is negative because energy is leaving the container. It is closed system As the container is rigid, the volume and total mass will stay the same between the initial and final state.  This means that the specific volume of water will stay constant.  Use the information in the bullet above to fine the quality of the mixture at the final state. Then, use the quality to perform the energy balance.

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.